[FSSDK-12454] cleanup

[junaed-optimizely]

Summary

• Remove all legacy top-level source files from src/ (24 files) that were superseded by the new subdirectory-based modules (client/, hooks/, logger/, provider/, utils/)
• Remove Jest and related packages (jest, jest-environment-jsdom, ts-jest, @types/jest), config (jest.config.js), and the test:legacy script - all tests now run exclusively via Vitest
• Update all internal import paths to remove explicit /index suffixes, preventing accidental resolution to old top-level files
• Simplify Vitest config by removing the per-subdirectory include list (no longer needed since old spec files are gone)
• Re-enable lint-staged with eslint --fix (was temporarily disabled during v6 migration)
• Remove Jest-specific .vscode/launch.json and jest: true from .eslintrc.js env

Test plan

• All 249 tests pass across 14 test files via vitest run

Issues

• FSSDK-12454

[Copilot]

Pull request overview

This PR removes superseded legacy top-level modules and Jest-era tooling, standardizing the codebase on the newer subdirectory-based modules (client/, provider/, hooks/, logger/, utils/) and Vitest-only testing.

Changes:

• Deleted legacy top-level src/* modules and their Jest-based specs that have been replaced by the subdirectory module structure.
• Removed Jest tooling/config and updated configs/scripts to rely exclusively on Vitest.
• Updated internal imports to avoid explicit /index suffixes and simplified Vitest coverage include paths.

Reviewed changes

Copilot reviewed 43 out of 45 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
vitest.config.mts	Simplifies test config by removing the per-subdirectory test include list and broadening coverage include to src/**.
src/index.ts	Updates public exports to reference module directories (no explicit /index suffix).
src/utils/UserContextManager.ts	Updates imports to use directory entrypoints (no explicit /index).
src/utils/UserContextManager.spec.ts	Updates imports to use directory entrypoints (no explicit /index).
src/provider/OptimizelyProvider.spec.tsx	Updates imports to use directory entrypoints (no explicit /index).
src/hooks/useProviderState.ts	Updates provider type imports to use directory entrypoints (no explicit /index).
src/hooks/useOptimizelyContext.ts	Updates provider imports to use directory entrypoints (no explicit /index).
src/hooks/useOptimizelyClient.spec.tsx	Updates provider/client imports to use directory entrypoints (no explicit /index).
src/hooks/useDecideForKeysAsync.spec.tsx	Updates provider imports to use directory entrypoints (no explicit /index).
src/hooks/useDecideForKeys.spec.tsx	Updates provider imports to use directory entrypoints (no explicit /index).
src/hooks/useDecideAsync.spec.tsx	Updates provider imports to use directory entrypoints (no explicit /index).
src/hooks/useDecideAllAsync.spec.tsx	Updates provider imports to use directory entrypoints (no explicit /index).
src/hooks/useDecideAll.spec.tsx	Updates provider imports to use directory entrypoints (no explicit /index).
src/hooks/useDecide.spec.tsx	Updates provider imports to use directory entrypoints (no explicit /index).
src/hooks/useAsyncDecision.ts	Updates provider type imports to use directory entrypoints (no explicit /index).
src/hooks/testUtils.tsx	Updates provider/client imports to use directory entrypoints (no explicit /index).
package.json	Removes Jest-related scripts/deps and re-enables lint-staged to run eslint --fix.
.eslintrc.js	Removes jest: true env now that Jest is removed.
jest.config.js	Removes Jest configuration file.
.vscode/launch.json	Removes Jest-specific VS Code launch configuration.
src/withOptimizely.tsx	Removes legacy top-level HOC implementation file.
src/withOptimizely.spec.tsx	Removes legacy top-level Jest test for withOptimizely.
src/Variation.tsx	Removes legacy top-level Variation component file.
src/utils.tsx	Removes legacy top-level utilities module (superseded by src/utils/*).
src/utils.spec.tsx	Removes legacy top-level Jest test for src/utils.tsx.
src/Provider.tsx	Removes legacy top-level Provider implementation file.
src/Provider.spec.tsx	Removes legacy top-level Jest test for src/Provider.tsx.
src/notifier.ts	Removes legacy top-level notifier implementation file.
src/notifier.spec.ts	Removes legacy top-level Jest test for notifier.
src/logOnlyEventDispatcher.ts	Removes legacy top-level event dispatcher implementation file.
src/logOnlyEventDispatcher.spec.ts	Removes legacy top-level Jest test for the dispatcher.
src/logger.tsx	Removes legacy top-level logger facade file.
src/logger.spec.ts	Removes legacy top-level Jest test for the logger.
src/index.cjs.ts	Removes legacy CommonJS entry shim.
src/hooks.ts	Removes legacy top-level hooks module file.
src/hooks.spec.tsx	Removes legacy top-level Jest test suite for hooks.
src/Feature.tsx	Removes legacy top-level Feature component file.
src/Feature.spec.tsx	Removes legacy top-level Jest test for Feature component.
src/Experiment.tsx	Removes legacy top-level Experiment component file.
src/Experiment.spec.tsx	Removes legacy top-level Jest test for Experiment component.
src/Context.ts	Removes legacy top-level Context module file.
src/client.ts	Removes legacy top-level client implementation file.
src/client.spec.ts	Removes legacy top-level Jest test for src/client.ts.
src/autoUpdate.ts	Removes legacy top-level auto-update helper file.

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